Dioxins (PCDD/PCDF), and polychlorinated biphenyls (PCBs), are classified as persistent organic pollutants (POPs). The main route of human exposure to these compounds is the diet, with food of animal origin being the dominant source (approximately 80%). The quality and safety of feed and feed ingredients has a direct impact on the safety of food obtained from animals. Feeds contribute significantly to the presence of these compounds in food. This is confirmed by numerous national and international incidents caused by dioxin-contaminated feed materials. Therefore, it is important to follow routes those pollutants find to feed. Thanks to this, it will be easier to reduce feed contamination, that is crucial for food safety and directly affects the reduction of the amount of dioxins taken up by humans.